import java.util.ArrayList;
import java.util.List;

public class Test6 {
    static int count = 0;
    public static void main(String[] args) throws InterruptedException {
        String str = new String("111");
        Thread t1 = new Thread(()->{
            synchronized (str) {
                for (int i = 0; i < 10000; i++) {
                    count++;
                }
            }
        });
        Thread t2 = new Thread(()->{
            synchronized (str) {
                for (int i = 0; i < 10000; i++) {
                    count++;
                }
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(count);
    }

}
